CN110488135B - Grounding fault judgment method and positioning strategy for high-power permanent magnet direct-drive locomotive converter - Google Patents
Grounding fault judgment method and positioning strategy for high-power permanent magnet direct-drive locomotive converter Download PDFInfo
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Abstract
The invention belongs to the field of judgment of ground faults of locomotive converters in electric traction alternating current transmission, and particularly relates to a method for judging ground faults of a high-power permanent magnet direct-drive locomotive converter and a positioning strategy. The fault judgment method comprises the following steps: information acquisition, information processing and ground fault judgment. Based on the fault judgment method, the invention further provides a starting stage ground fault positioning strategy and an operating stage ground fault positioning strategy. The judgment method and the fault positioning strategy provided by the invention are suitable for a 2-in-one-3-inverse-1-auxiliary high-power permanent magnetic direct-drive traction auxiliary converter sharing a direct current bus, and aim to provide a ground fault detection judgment strategy on the premise of not increasing hardware detection cost, and can correctly distinguish the ground faults of the input side, the middle direct current bus side and the output side of the converter, so as to solve the problems that the ground fault cannot be detected in time, wrongly and accurately positioned by detection in the prior art.
Description
Technical Field
The invention belongs to the field of judgment of ground faults of locomotive converters in electric traction alternating current transmission, and particularly relates to a method for judging ground faults of a high-power permanent magnet direct-drive locomotive converter and a positioning strategy.
Background
The high-power permanent magnet direct-drive locomotive converter adopts a main and auxiliary integrated structure design, comprises a rectifier, a filter circuit, an intermediate direct current loop, a grounding voltage detection circuit, a traction inverter, an auxiliary inverter and the like, provides safe and reliable electric power requirements for a whole locomotive system, and is a core component of the whole locomotive. When the traction auxiliary converter has a ground fault in the starting and running processes, if effective measures cannot be found and taken in time, the normal running of the whole transmission system is damaged, and even other faults are caused, so that partial or whole traction loss of a vehicle occurs, and the driving safety of the whole vehicle is influenced.
Nowadays, with the increasing requirements of safe and reliable operation of railways, more and more attention is paid to fault diagnosis in a transmission system, but until now, the ground protection of a traction auxiliary converter is less researched. The existing direct current circuit electric bridge grounding detection method is only to perform protection action after detecting a grounding fault, cannot specifically distinguish a grounding point, and is not beneficial to accurate positioning and troubleshooting after the fault occurs. In other part of locomotives, a method of adding a logic judgment strategy based on a direct current loop bridge is adopted, although the input side grounding of a converter, the positive grounding of a direct current bus, the negative grounding of the direct current bus and the output side grounding of the converter can be distinguished, the grounding of a traction inverter and the grounding of an auxiliary inverter cannot be distinguished, and the phase sequence of the input side grounding cannot be distinguished. In addition, in the permanent magnet transmission system, due to the existence of back electromotive force and isolated contact, the grounding fault detection method of the permanent magnet system converter and the asynchronous system converter is different, but research related to the high-power permanent magnet system converter is very limited.
Patent application CN201811338927.0 introduces a method for determining grounding of a main loop of a traction converter of an ac-dc-ac electric locomotive: the intermediate dc bus voltage signal detected in real time and the ground voltage signal between the intermediate ground point and the dc bus negative electrode can detect the dc side positive/negative ground and the ac side ground based on the change of the difference signal in a fixed time, and the ac side can distinguish between the input side ground and the output side ground. When traction converter major loop has two four-quadrant rectifier modules and three contravariant module, can also carry out the location judgement of concrete ground point: if the input side is grounded, whether the four-quadrant module 1 is grounded or the four-quadrant module 2 is grounded can be judged; if the output side is grounded, the grounding of the inversion module 1, the inversion module 2 or the inversion module 3 can be distinguished. The method can realize the detection of the converter ground fault and the differentiation of the input ground and the output ground, but has the following defects: (1) failing to distinguish traction inverter grounding from auxiliary inverter grounding; (2) when the input grounding and the output grounding are distinguished, all inversion side pulses need to be blocked, so that the load is suddenly cut, the traction of a converter is completely lost, and the system fault is easily induced; in addition, the method is designed for an asynchronous converter system, the influence of back electromotive force and the existence of an isolation contactor in a permanent magnet system cannot be considered, and the method cannot be well applied to the permanent magnet traction system.
Patent application CN201811338010.0 relates to a locomotive converter ground fault detection circuit and method, based on the ground voltage detection circuit who optimizes, according to frequency and the phase information that obtains input voltage, output voltage, the position of location converter ground fault can accurately distinguish the problem of the phase sequence of input side and output load side ground connection. The method can realize the fault detection of the input grounding, the positive grounding of the direct current bus, the negative grounding of the direct current bus and the output grounding of the converter and the phase sequence distinction of the input grounding and the output grounding, but has the following defects: (1) the grounding judgment algorithm is complex to realize, Fourier calculation is needed, the calculation load of the system is increased, and the cost is increased; (2) the method is only suitable for an auxiliary converter system and a single-shaft inverter system of the locomotive, and is not suitable for a 2-in-one, 3-inverse and 1-auxiliary high-power permanent-magnet direct-drive converter.
Disclosure of Invention
The invention provides a method for judging and detecting the ground fault of a high-power permanent magnet direct-drive locomotive converter and a positioning strategy, aiming at solving the problem of judging and detecting the ground fault of a 2-in-one-3-inverse-1-auxiliary high-power permanent magnet direct-drive traction auxiliary converter sharing a direct current bus on the premise of not increasing the hardware detection cost.
The invention is realized by the following technical scheme: a method for judging the grounding fault of a high-power permanent magnet direct-drive locomotive converter comprises the following steps:
(1) information acquisition:
the grounding voltage detection circuit is characterized in that two divider resistors R1 and R2 with the same resistance value are connected in series and then connected in parallel at two ends of the middle direct current bus as a whole, an intermediate grounding point is arranged between the two divider resistors R1 and R2, and the voltage U1 of the middle direct current bus and the voltage U2 between the intermediate grounding point and the anode of the middle direct current bus are detected;
(2) information processing
a. After the intermediate direct-current bus voltage U1 is subjected to low-pass filtering, the filtered intermediate direct-current bus voltage U1_ lpf is obtained;
b. after low-pass filtering processing is carried out on the grounding voltage U2, a filtered grounding voltage U2_ lpf is obtained;
c. calculating a voltage difference between 0.5 × U1_ lpf and U2_ lpf in real time to obtain a difference signal U3, that is, U3= U2_ lpf-0.5 × U1_ lpf;
(3) ground fault determination
a. When the difference signal U3 is less than-0.3U 1, the fault that the intermediate direct current bus is grounded is judged;
b. when the difference signal U3 is greater than 0.3 × U1, the middle direct-current bus is judged to be in a negative ground fault;
c. when the difference signal U3 jumps for multiple times between a state larger than 0.3U 1 and a state smaller than-0.3U 1 within a fixed time, the alternating current ground fault is judged;
d. when the difference signal U3 is equal to or greater than-0.3 × U1 and equal to or less than 0.3 × U1, it is determined that there is no ground fault.
As a further improvement of the technical solution of the determination method of the present invention, the voltage U1 and the voltage U2 are obtained by voltage sensor detection.
The invention further provides a starting stage earth fault positioning strategy based on the high-power permanent magnet direct drive locomotive converter earth fault judgment method, which comprises the following steps:
i, closing a main breaker, starting positive and negative ground fault detection, and grounding a homonymous terminal of an input side if an alternating current ground fault exists; otherwise, starting the four-quadrant rectifier;
after the four-quadrant rectifier is started, if an alternating current grounding fault exists, grounding the synonym end of the input side; if the middle direct current bus is in positive grounding fault, the middle direct current bus is in positive grounding; if the middle direct current bus negative grounding fault exists, the middle direct current bus negative grounding is carried out; otherwise, starting the auxiliary inverter;
after the auxiliary inverter is started, if an alternating current grounding fault exists, grounding the auxiliary inverter on the output side; otherwise, starting the traction inverter;
IV, after the traction inverter is started, if an alternating current grounding fault exists, the traction inverter is grounded on the output side; otherwise, the system operates normally without ground fault.
The invention further provides an operating stage ground fault positioning strategy based on the high-power permanent magnet direct drive locomotive converter ground fault judgment method, and the operating stage ground fault positioning strategy is carried out after ground fault-free judgment in the starting stage ground fault positioning strategy is completed.
The operation phase ground fault positioning strategy comprises the following steps:
(1) in the normal operation process, if the positive grounding fault of the middle direct current bus occurs, the middle direct current bus is grounded; if the negative grounding fault of the middle direct current bus occurs, the middle direct current bus is negatively grounded; if the alternating current side grounding fault occurs, blocking the pulse of the traction inverter 1; otherwise, the operation is normal without ground fault;
(2) after the pulse of the traction inverter 1 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 1 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 1 is pulled to be grounded by the output side; otherwise, continuing to block the pulse of the traction inverter 2;
(3) after the pulse of the traction inverter 2 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 2 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 2 is pulled to be grounded for the output side; otherwise, continuing to block the traction inverter 3 pulse;
(4) after the pulse of the traction inverter 3 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 3 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 3 is pulled to be grounded for the output side; otherwise, continuing to block the auxiliary inverter pulse;
(5) after the auxiliary inverter pulse is blocked, the earth fault detection is carried out again after 20ms of delay; if the grounding fault of the alternating current side does not occur any more within 100ms, the output side auxiliary inverter is grounded; otherwise, continuing to block the pulse of the four-quadrant rectifier 1;
(6) after the four-quadrant rectifier 1 pulse is blocked, after 20ms of delay, earth fault detection is carried out again; if the grounding fault of the alternating current side does not occur any more within 100ms, grounding the four-quadrant rectifier 1 on the input side; otherwise, the input side four-quadrant rectifier 2 is grounded.
The judgment method and the fault positioning strategy provided by the invention are suitable for a 2-in-one-3-inverse-1-auxiliary high-power permanent magnetic direct-drive traction auxiliary converter sharing a direct current bus, and aim to provide a ground fault detection judgment strategy on the premise of not increasing hardware detection cost, and can correctly distinguish the ground faults of the input side, the middle direct current bus side and the output side of the converter, so as to solve the problems that the ground fault cannot be detected in time, wrongly and accurately positioned by detection in the prior art. The method is simple and rapid, does not need to increase extra cost, and is accurate and reliable in fault location. The invention can timely and accurately judge the grounding fault, so that the control system can take effective measures to prevent the fault from being enlarged and endangering the driving safety; the invention can accurately position the fault point, effectively eliminate the fault influence and keep the traction performance of the whole vehicle to the greatest extent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is an overall block diagram of the ground fault determination of the present invention. Wherein part 1 is the basis for each fault detection in parts 2 and 3.
Fig. 2 is a schematic structural diagram of the high-power permanent-magnet direct-drive traction auxiliary converter. In the figure, an AC end is a 25kV alternating current input side, a part of the AC end is a step-down transformer unit, and an original transformer A end and a secondary transformer a end of the transformer are homonymous ends; part II is a rectifying unit which is divided into a four-quadrant rectifier 1 and a four-quadrant rectifier 2; part III is a middle direct current bus unit, the plus sign end is a direct current bus anode, and the minus sign end is a direct current bus cathode; part IV is a traction inversion unit and is divided into a traction inverter 1 (U)1、V1、W1For three-phase output), a traction inverter 2 (U)2、V2、W2For three-phase output), traction inverter 3 (U)3、V3、W3To a corresponding three-phase output); part of the fifth step is an auxiliary inverter unit, and u, v and w are three-phase output of the auxiliary inverter respectively. Wherein, the right side of the part (r) and the part (r) of the diagram is the output side respectively.
Fig. 3 is a flowchart of a method for determining a ground fault according to the present invention.
Fig. 4 is a flowchart of a start-up phase ground fault location strategy.
Fig. 5 is a flow chart of an operation phase ground fault location strategy.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
The invention mainly aims at the ground fault detection during the starting and the running of the traction auxiliary converter of the high-power permanent magnet direct drive system, and realizes the ground protection under the full working condition. The ground fault detection mainly comprises: the input side homonymous end grounding, the input side synonym end grounding, the middle direct-current bus positive grounding, the middle direct-current bus negative grounding, the output side traction inverter grounding and the output side auxiliary inverter grounding are carried out, and the total number of the grounding points is 6; and accurate judgment of starting grounding and grounding in operation can be realized. The invention is suitable for a high-power permanent magnet direct-drive traction auxiliary converter of a 2-in-one, 3-inverse and 1-auxiliary (two four-quadrant rectification modules, three traction inversion modules and one auxiliary inverter) sharing a direct-current bus, as shown in figure 2.
A method for judging the grounding fault of a high-power permanent magnet direct-drive locomotive converter comprises the following steps:
(1) information acquisition:
the grounding voltage detection circuit is characterized in that two divider resistors R1 and R2 with the same resistance value are connected in series and then connected in parallel at two ends of the middle direct current bus as a whole, an intermediate grounding point is arranged between the two divider resistors R1 and R2, and the voltage U1 of the middle direct current bus and the voltage U2 between the intermediate grounding point and the anode of the middle direct current bus are detected;
(2) information processing
a. After the intermediate direct-current bus voltage U1 is subjected to low-pass filtering, the filtered intermediate direct-current bus voltage U1_ lpf is obtained;
b. after low-pass filtering processing is carried out on the grounding voltage U2, a filtered grounding voltage U2_ lpf is obtained;
c. calculating a voltage difference between 0.5 × U1_ lpf and U2_ lpf in real time to obtain a difference signal U3, that is, U3= U2_ lpf-0.5 × U1_ lpf;
(3) ground fault determination
a. When the difference signal U3 is less than-0.3U 1, the fault that the intermediate direct current bus is grounded is judged;
b. when the difference signal U3 is greater than 0.3 × U1, the middle direct-current bus is judged to be in a negative ground fault;
c. when the difference signal U3 jumps for multiple times between a state larger than 0.3U 1 and a state smaller than-0.3U 1 within a fixed time, the alternating current ground fault is judged;
d. when the difference signal U3 is equal to or greater than-0.3 × U1 and equal to or less than 0.3 × U1, it is determined that there is no ground fault.
In the present invention, the voltage U1 and the voltage U2 are obtained by voltage sensor detection. Specifically, as shown in fig. 2, the voltage U1 is detected by a voltage sensor TV1 connected in parallel at the positive and negative ends of the intermediate bus, and the voltage U2 is detected by a voltage sensor TV2 connected in parallel at the positive end of the intermediate bus and the intermediate ground point.
In the invention, the low-pass filtering process is realized by a digital low-pass filter, and the differential equation of a common hardware RC low-pass filter is expressed by a differential equation, so that the function of hardware filtering can be simulated by adopting a software algorithm.
The invention further provides a specific embodiment, after the fault method is applied to a certain high-power permanent magnet direct-drive locomotive converter, in the process of judging the ground fault: a. when the intermediate direct current bus is grounded, U1=2800V, U2=0V, and U3= -1400V after low-pass filtering; b. when the intermediate direct current bus is negatively grounded, U1=2800V, U2=2800V, and U3=1400V after the low-pass filtering process.
In the invention, the judgment basis of the starting phase ground fault positioning strategy and the operating phase ground fault positioning strategy is realized according to the fault judgment method.
As shown in fig. 4, a start-up phase ground fault location strategy based on the ground fault determination method for the high-power permanent-magnet direct-drive locomotive converter includes the following steps:
closing a main breaker (a main breaker), starting positive and negative ground fault detection (ground fault judgment in step (3)), and grounding an input side homonymous end if an alternating-current ground fault exists (according with steps (3) -c); otherwise, starting the four-quadrant rectifier;
after the four-quadrant rectifier is started, if an alternating current grounding fault exists (according with the steps (3) -c), grounding the synonym end of the input side; if the middle direct current bus is in positive grounding fault (according with the step (3) -a), the middle direct current bus is in positive grounding; if the middle direct current bus negative grounding fault exists (the step (3) -b), the middle direct current bus negative grounding is carried out; otherwise, starting the auxiliary inverter;
after the auxiliary inverter is started, if an alternating current grounding fault exists (according with the steps (3) -c), grounding the auxiliary inverter on the output side; otherwise, starting the traction inverter;
IV, after the traction inverter is started, if an alternating current grounding fault exists (according with the steps (3) -c), grounding the traction inverter at the output side; otherwise, the system operates normally without ground fault.
The invention further provides an operation stage ground fault positioning strategy based on the high-power permanent magnet direct drive locomotive converter ground fault judgment method, and the operation stage ground fault positioning strategy is carried out after ground fault-free judgment in the starting stage ground fault positioning strategy is completed.
As shown in fig. 5, an operating phase ground fault positioning strategy based on the ground fault determination method for the high-power permanent magnet direct drive locomotive converter according to claim 1 includes the following steps:
(1) in the normal operation process, if the positive grounding fault of the middle direct current bus occurs (which is in accordance with the step (3) -a), the middle direct current bus is grounded; if the negative grounding fault of the middle direct current bus occurs (the step (3) -b), the middle direct current bus is grounded negatively; if an alternating current side grounding fault occurs (according to the steps (3) -c), blocking the traction inverter 1 pulse; otherwise, the operation is normal without ground fault;
(2) after the pulse of the traction inverter 1 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 1 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 1 is pulled to be grounded by the output side; otherwise, continuing to block the pulse of the traction inverter 2;
(3) after the pulse of the traction inverter 2 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 2 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 2 is pulled to be grounded for the output side; otherwise, continuing to block the traction inverter 3 pulse;
(4) after the pulse of the traction inverter 3 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 3 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 3 is pulled to be grounded for the output side; otherwise, continuing to block the auxiliary inverter pulse;
(5) after the auxiliary inverter pulse is blocked, the earth fault detection is carried out again after 20ms of delay; if the grounding fault of the alternating current side does not occur any more within 100ms, the output side auxiliary inverter is grounded; otherwise, continuing to block the pulse of the four-quadrant rectifier 1;
(6) after the four-quadrant rectifier 1 pulse is blocked, after 20ms of delay, earth fault detection is carried out again; if the grounding fault of the alternating current side does not occur any more within 100ms, grounding the four-quadrant rectifier 1 on the input side; otherwise, the input side four-quadrant rectifier 2 is grounded.
Referring to fig. 2, the positions of the fault points in the present invention are respectively:
if the secondary change a end of the first part is grounded, the same name end of the input side is grounded;
if the secondary x-changing end of the part I is grounded, the fault is the grounding fault of the synonym end of the input side;
if the positive electrode of the third part is grounded, the positive grounding fault of the middle direct current bus is detected;
if the negative electrode of the third part is grounded, the third part is a negative grounding fault of the intermediate direct current bus;
v, if any one of U, V, W phases in the part (iv) is grounded, the output side traction inverter is in ground fault;
if any phase of u, v and w phases of part fifth is grounded, the auxiliary inverter on the output side is grounded;
the input side homonymous terminal grounding fault and the input side synonym terminal grounding fault are collectively called as an input side four-quadrant rectification grounding fault; in the 2-in-3 inverse main circuit topological structure, the grounding can be subdivided into the grounding fault of the input side four-quadrant rectifier 1 and the grounding fault of the input side four-quadrant rectifier 2 according to different rectifying side grounding; according to different inverter side earthing, the system can be subdivided into an output side traction inverter 1 earthing fault, an output side traction inverter 2 earthing fault and an output side traction inverter 3 earthing fault.
By adopting the judgment strategy, when grounding occurs in the starting stage, grounding of a homonymous terminal of an input side, grounding of a synonym terminal of the input side, positive grounding of an intermediate direct-current bus, negative grounding of the intermediate direct-current bus, grounding of a traction inverter of an output side and grounding of an auxiliary inverter of the output side can be correctly distinguished; when grounding occurs in the operation stage, grounding of the input side four-quadrant rectifier 1, grounding of the input side four-quadrant rectifier 2, positive grounding of the middle direct-current bus, negative grounding of the middle direct-current bus, grounding of the output side traction inverter 1, grounding of the output side traction inverter 2, grounding of the output side traction inverter 3 and grounding of the output side auxiliary inverter can be correctly distinguished.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (4)
1. A starting stage earth fault positioning strategy based on a high-power permanent magnet direct drive locomotive converter earth fault judgment method is characterized by comprising the following steps:
(1) information acquisition:
the grounding voltage detection circuit is characterized in that two divider resistors R1 and R2 with the same resistance value are connected in series and then connected in parallel at two ends of the middle direct current bus as a whole, an intermediate grounding point is arranged between the two divider resistors R1 and R2, and the voltage U1 of the middle direct current bus and the voltage U2 between the intermediate grounding point and the anode of the middle direct current bus are detected;
(2) information processing
a. After the intermediate direct-current bus voltage U1 is subjected to low-pass filtering, the filtered intermediate direct-current bus voltage U1_ lpf is obtained;
b. after low-pass filtering processing is carried out on the grounding voltage U2, a filtered grounding voltage U2_ lpf is obtained;
c. calculating a voltage difference between 0.5 × U1_ lpf and U2_ lpf in real time to obtain a difference signal U3, that is, U3= U2_ lpf-0.5 × U1_ lpf;
(3) ground fault determination
a. When the difference signal U3 is less than-0.3U 1, the fault that the intermediate direct current bus is grounded is judged;
b. when the difference signal U3 is greater than 0.3 × U1, the middle direct-current bus is judged to be in a negative ground fault;
c. when the difference signal U3 jumps for multiple times between a state larger than 0.3U 1 and a state smaller than-0.3U 1 within a fixed time, the alternating current ground fault is judged;
d. when the difference signal U3 is greater than or equal to-0.3 × U1 and less than or equal to 0.3 × U1, it is determined that there is no ground fault;
(4) start-up phase ground fault location strategy
I, closing a main breaker, starting positive and negative ground fault detection, and grounding a homonymous terminal of an input side if an alternating current ground fault exists; otherwise, starting the four-quadrant rectifier;
after the four-quadrant rectifier is started, if an alternating current grounding fault exists, grounding the synonym end of the input side; if the middle direct current bus is in positive grounding fault, the middle direct current bus is in positive grounding; if the middle direct current bus negative grounding fault exists, the middle direct current bus negative grounding is carried out; otherwise, starting the auxiliary inverter;
after the auxiliary inverter is started, if an alternating current grounding fault exists, grounding the auxiliary inverter on the output side; otherwise, starting the traction inverter;
IV, after the traction inverter is started, if an alternating current grounding fault exists, the traction inverter is grounded on the output side; otherwise, the system operates normally without ground fault.
2. The starting-stage ground fault location strategy based on the high-power permanent magnet direct drive locomotive converter ground fault judgment method according to claim 1, characterized in that the voltage U1 and the voltage U2 are obtained through detection of voltage sensors.
3. An operating stage ground fault positioning strategy based on a high-power permanent magnet direct drive locomotive converter ground fault judgment method is characterized in that the operating stage ground fault positioning strategy is carried out after the ground fault-free judgment in the starting stage ground fault positioning strategy of the step (4) in the claim 1 or 2 is completed.
4. The operation stage ground fault positioning strategy based on the high-power permanent magnet direct drive locomotive converter ground fault judgment method according to claim 3, is characterized by comprising the following steps:
(1) in the normal operation process, if the positive grounding fault of the middle direct current bus occurs, the middle direct current bus is grounded; if the negative grounding fault of the middle direct current bus occurs, the middle direct current bus is negatively grounded; if the alternating current side grounding fault occurs, blocking the pulse of the traction inverter 1; otherwise, the operation is normal without ground fault;
(2) after the pulse of the traction inverter 1 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 1 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 1 is pulled to be grounded by the output side; otherwise, continuing to block the pulse of the traction inverter 2;
(3) after the pulse of the traction inverter 2 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 2 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 2 is pulled to be grounded for the output side; otherwise, continuing to block the traction inverter 3 pulse;
(4) after the pulse of the traction inverter 3 is blocked, delaying for 200ms, and after the isolation contactor of the traction inverter 3 is disconnected, carrying out earth fault detection again; if the grounding fault of the alternating current side does not occur any more within 100ms, the inverter 3 is pulled to be grounded for the output side; otherwise, continuing to block the auxiliary inverter pulse;
(5) after the auxiliary inverter pulse is blocked, the earth fault detection is carried out again after 20ms of delay; if the grounding fault of the alternating current side does not occur any more within 100ms, the output side auxiliary inverter is grounded; otherwise, continuing to block the pulse of the four-quadrant rectifier 1;
(6) after the four-quadrant rectifier 1 pulse is blocked, after 20ms of delay, earth fault detection is carried out again; if the grounding fault of the alternating current side does not occur any more within 100ms, grounding the four-quadrant rectifier 1 on the input side; otherwise, the input side four-quadrant rectifier 2 is grounded.
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| CN111766534B (en) * | 2020-06-07 | 2021-07-13 | 中车永济电机有限公司 | Traction converter ground fault detection method and device |
| CN112098890B (en) * | 2020-09-16 | 2023-04-28 | 中车青岛四方车辆研究所有限公司 | Alternating-current grounding fault detection method for parallel auxiliary converters of motor train unit |
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